This list of recommendations comes from personal experience and/or podcasts that have earned my trust. I’ve tried one thing another from each of these sellers, but not enough to leave a detailed rating for each.
Seed Savers Exchange
Seed Savers Exchange is a nonprofit selling rare and organic seeds.
High Mowing Organic Seeds
High Mowing sells certified organic and non-GMO seeds, great for your organic garden.
Sow True Seed
Sow True is a tiny company offering organic, heirloom and southern seeds and lots of varieties.
Johnny’s Selected Seeds
Johnny’s not only sells seeds but tools and supplies as well.
Botanical Interests
Non-GMO seeds including heirloom, organic, open pollinated and many more.
Seeds of Change
Rice, grains and other seeds.
Southern Exposure Seed Exchange
Support a network of growers and tiny seed companies.
Territorial Seed Company
Territorial seeds are certified organic, biodynamic and heirloom seeds.
If none if these options provides what you’re looking for, or you’d prefer to purchase from a local vendor within your climate region, you have options. Local farmers markets, local gardening groups, or Etsy, are all resources I’ve used as well.